I understand that HDR files are images encoded with a higher precision in order to keep more details.
When loading such images in real-time rendering applications using common Graphics APIs (DirectX, OpenGL, Vulkan), which are the "HDR texture formats" that ensure details will be preserved?

  • Are you talking about the texel formats the GPU understands, or are you talking about the file formats that images are stored in before texture upload? – Dan Hulme Nov 6 at 9:20
  • About the former – wil Nov 6 at 13:03
  • But connecting those with details about how the data is arranged in the image files would be interesting as well Dan. – wil Nov 6 at 13:05

In general, using floating point textures will help preserve HDR values. They can be 16-bit or 32-bit floats for the color channels, usually. In OpenGL you could choose the type to be GL_FLOAT for 32-bits per channel or GL_HALF_FLOAT for 16-bits per channel. In my experience, for image processing, 16-bits is usually enough and is half as much data.

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